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That is good, because I have no idea what that this loophole should have been :D

"Slang" is bad for international communication ;)

For more on wording etc. see my latest post.

We have gun shows here and people claim that you don't need a permit to sell guns at one but that is false, they claim some loophole exists that allows such sales but no such loophole exists. It's a sideways attempt to end private sales where one legal owner may sell directly to another legal owner guns they already own. But it has to be non commercial, if you are making a profit or buying guns you intend to sell then you need a federal permit. If you make a business of selling guns, even if you sell one gun in a commercial way, then you require a permit whether you are at a gun show or anywhere else.
If they ask about private sales though they will get way different results than asking about "the gun show loophole".

You could write a poll question and if you use the word "loophole" any decent person should be in favor of closing it right? "loopholes" are bad and unfair, who likes "loopholes"? "Loopholes" make a mockery of the whole system, if you want people to not like something, just call it a loophole.